private AggregationBuilder createNestedAggregation(Field field) {
AggregationBuilder nestedBuilder;
String nestedPath = field.getNestedPath();
if (field.isReverseNested()) {
if (nestedPath == null || !nestedPath.startsWith("~"))
return AggregationBuilders.reverseNested(getNestedAggName(field)).path(nestedPath);
nestedPath = nestedPath.substring(1);
}
nestedBuilder = AggregationBuilders.nested(getNestedAggName(field)).path(nestedPath);
return nestedBuilder;
}
@Override
public SqlElasticSearchRequestBuilder explain() throws SqlParseException {
this.request = client.prepareSearch();
request.setListenerThreaded(false);
setIndicesAndTypes();
setWhere(select.getWhere());
AggregationBuilder<?> lastAgg = null;
for (List<Field> groupBy : select.getGroupBys()) {
if (!groupBy.isEmpty()) {
Field field = groupBy.get(0);
lastAgg = aggMaker.makeGroupAgg(field);
if (lastAgg != null && lastAgg instanceof TermsBuilder && !(field instanceof MethodField)) {
((TermsBuilder) lastAgg).size(select.getRowCount());
}
if (field.isNested()) {
AggregationBuilder nestedBuilder = createNestedAggregation(field);
if (insertFilterIfExistsAfter(lastAgg, groupBy, nestedBuilder, 1)) {
groupBy.remove(1);
} else {
nestedBuilder.subAggregation(lastAgg);
}
request.addAggregation(wrapNestedIfNeeded(nestedBuilder, field.isReverseNested()));
} else {
request.addAggregation(lastAgg);
}
for (int i = 1; i < groupBy.size(); i++) {
field = groupBy.get(i);
AggregationBuilder<?> subAgg = aggMaker.makeGroupAgg(field);
if (subAgg instanceof TermsBuilder && !(field instanceof MethodField)) {
((TermsBuilder) subAgg).size(0);
}
if (field.isNested()) {
AggregationBuilder nestedBuilder = createNestedAggregation(field);
if (insertFilterIfExistsAfter(subAgg, groupBy, nestedBuilder, i + 1)) {
groupBy.remove(i + 1);
i++;
} else {
nestedBuilder.subAggregation(subAgg);
}
lastAgg.subAggregation(wrapNestedIfNeeded(nestedBuilder, field.isReverseNested()));
} else {
lastAgg.subAggregation(subAgg);
}
lastAgg = subAgg;
}
}
}
Map<String, KVValue> groupMap = aggMaker.getGroupMap();
// add field
if (select.getFields().size() > 0) {
setFields(select.getFields());
explanFields(request, select.getFields(), lastAgg);
}
// add order
if (lastAgg != null && select.getOrderBys().size() > 0) {
for (Order order : select.getOrderBys()) {
KVValue temp = groupMap.get(order.getName());
if (temp != null) {
TermsBuilder termsBuilder = (TermsBuilder) temp.value;
switch (temp.key) {
case "COUNT":
termsBuilder.order(Terms.Order.count(isASC(order)));
break;
case "KEY":
termsBuilder.order(Terms.Order.term(isASC(order)));
// add the sort to the request also so the results get sorted as well
request.addSort(order.getName(), SortOrder.valueOf(order.getType()));
break;
case "FIELD":
termsBuilder.order(Terms.Order.aggregation(order.getName(), isASC(order)));
break;
default:
throw new SqlParseException(order.getName() + " can not to order");
}
} else {
request.addSort(order.getName(), SortOrder.valueOf(order.getType()));
}
}
}
setLimitFromHint(this.select.getHints());
request.setSearchType(SearchType.DEFAULT);
updateRequestWithIndexAndRoutingOptions(select, request);
SqlElasticSearchRequestBuilder sqlElasticRequestBuilder =
new SqlElasticSearchRequestBuilder(request);
return sqlElasticRequestBuilder;
}